# alias: Impossible2S
# button-text: Impossible 2S
# gib-works: true
# bba-works: true
# auction-filter: Auction.....\n(1H +Pass +1NT?.* Pass\n2[CD] +Pass +2S)
# convention-card-ns: 21GF-DEFAULT
# convention-card-ew: 21GF-GIB

/*@chat
--- Impossible 2S
South opens 1H with 12-18 HCP and 5+ !H.  North has an invitational
minor oriented hand not suitable for NT or !H and responds 1NT with 11-12
HCP.  With only 5!H South rebids a minor.  North has support for South's
minor and rebids the Impossible 2!S.  If South rebids 2!H, North needs
6/5 or better in the minors to bid the Impossible 2!S.
http://kivabridgeclub.com/images/Impossible%202%20Spade.pdf
@chat*/

# Turn on 'Imposible 2S' (sic); turn off '1N opening shape 5422'

# To find those that don't match add ?! after the opening parenthesis

# The bidding sequence is 1H Pass 1NT (forcing, semi-forcing, or not forcing) Pass 2C/D Pass 2S
dealer south

#include "script/Calm-Opponents"
# Defines calmOpps

#include "script/GIB-1N"
# Defines gibNT

#include "script/TP"
# Defines tpNorth

# allow for extreme shapes -- if south rebids 2H, north needs 6/5+ in the minors to bid the impossible 2S
hSouth = hearts(south)==5 or (hearts(south)>5 and shape(north,2065+2056+1165+1156) and (hcp(north,spades)+hcp(north,hearts))==0)

# limit spades to avoid a reverse and limit HCP to avoid a jump shift
oneH = hSouth and spade(south)<4 and diamonds(south)<6 and clubs(south)<6 and hcp(south)>10 and tpSouth>11 and tpSouth<18 and not gibNT

# Things to avoid...
twoOver1 = hcp(north)>12 and tpNorth>13

cNorth = clubs(north)>5 and hcp(north,clubs)>1
dNorth = diamonds(north)>5 and hcp(north,diamonds)>1
invJump = (cNorth or dNorth) and hcp(north)>8 and hcp(north)<12

# North is invitational with <4 spades and <3 hearts support
oneN = spades(north)<4 and hearts(north)<3 and hcp(north)>10 and not (twoOver1 or invJump) 

# South rebids a minor and North has support
rebidC = clubs(south)>=diamonds(south) and clubs(north)>3    and clubs(north)>diamonds(north)
rebidD = diamonds(south)>clubs(south)  and diamonds(north)>3 and diamonds(north)>clubs(north)
sRebid = (rebidC or rebidD)

# North is not suitable for a 2N rebid
nTwoS = shape(north,any 0xxx+any 1xxx)

# Now do it
oneH and oneN and sRebid and nTwoS and calmOpps

action
average "South H = 5  " 100 * (hearts(south)==5),
average "South H > 5  " 100 * (hearts(south)>5),
average "North 0/1 S  " 100 * (spades(north)<2),
average "North 0/1 H  " 100 * (hearts(north)<2),
average "North 6/5+CD " 100 * (clubs(north)>4 and diamonds(north)>4 and clubs(north)+diamonds(north)>10),